The infusion pump is configured so that a primary finger 21 has inclined surface 21a which is obliquely inclined to an advancing and retracting direction, while a secondary finger 23 has an inclined surface 23a which is slidable relative to the inclined surface 21a of the primary finger 21, thereby when the primary finger 21 is advanced, the secondary finger 23 is retracted in proportion to the variation (increasing) in an entire width of an infusion tube T, while when the primary finger 21 is retracted, the secondary finger 23 is advanced in proportion the variation (decreasing) in the entire width of the infusion tube T. This configuration can suppress the occurrence of any gap between a tip surface of the secondary finger 23 and an outer peripheral surface of the infusion tube T in the advancing and retracting process of the primary finger 21. Consequently, this allows preventing the infusion tube T from meandering, and the reduction in the accuracy of the rate of infusion can be suppressed.
